<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .box{
            color:yellow;
        }
    </style>

    <script src="./react/react.development.js"></script>
    <script src="./react/react-dom.development.js"></script>
    <script src="./react/babel.min.js"></script>
</head>
<body>
<div id="app"></div>
<script type="text/babel">

    //JSX=JS+xml、
    let app = document.querySelector('#app');
    let root = ReactDOM.createRoot(app);

    //子组件 函数组件
    function Welcome(props){
        return (
            <div>hello world, {props.msg}</div>
        )
    }

    //父组件 类组件
    class Welcome1 extends React.Component{
        render(){
            return (
                <div>
                    hello world ,{this.props.msg}
                    <br />
                    <Welcome  msg = "hi react funciton"/>
                </div>
            )
        }
    }

    let element1 = (<Welcome1 msg = "hi react class"/>)

    root.render(element1);


</script>
</body>
</html>